Apparatus for filtering solutions used in the manufacture of artificial silk and thelike



& Ifiwfiw W. P. DREAPEW APPARATUS FOR FILTERING SOLUTIONS USED IN THE MANUFACTURE OF ARTIFICIAL SILK AND THE LIKE Filed. June 2, 1923 ill lhlhllAAtt' TUltltTlfillEt llJfilElAlPEllt, UT HlElTtllPSTlEAD HEATH, LUNUUN, lElll'tGllhAlfilU.

APPARATUS lli'UlEt Ili'TlLTlERTTIlf-t fiUTrUTTUlfifi UfilEID IN THE MANUFACTURE 01E TTFTU fiTlhM AND THE LIKE.

Application filed. time a, Witt, Aerial lt'o. mama, and in ttreat firitaln Tune In the manufacture of artificial silk and the like products such as staple fibre a so-called candle filter is often used to finally filter the solution of cellulose or other material just before the said solution passes to the jet under the required pressure, and is then formed into filaments, ribbon or the like by well known means.

ll now find that more satisfactory and regular results than hitherto, can be obtained and a more perfect and even filtration of the solution causing less disarrangement-to the layers of filtering fabric used, especially when con-. siderable pressure is required for filtering by using a type of filter or fabric holder hereinafter described with the accompanying drawing showing sectional elevation of my invention.

My invention comprises the usual outer casing a, of any convenient material such asebonite of sutficient strength to withstand the pressure at which the solution is delivered to the filter, and if desired a suitable relief valve may be attached to the outer filter casing so that the pressure may not exceed a predetermined amount, or the said outer casing a, may

- be reinforced in any suitable manner.

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The aforesaid outer casing 01, has a swivel connection I), through which the solution enters at 0, into this outer casing. Said casing a, is directly screwed or otherwise secured at d, to a spinning jet, and its attachment 6, which in turn is provided with a screw cap 7, as shown in the accompanying drawing.

The outer casing a, can easily be removed from the spinning jet and its attachmentc, for cleanin purposes, and for replacing the filtering fa ric which is wound or otherwise attached to the corrugated surface g, of the fitlering member h, integral with the spinning jet and its attachment e.

The filtering member it, has a central duct z, for the purpose of holding the enlarged end of a glass or other tube, which serves to carry the filament solution away from the jet itself.

The solution enters into the outer part of the filter and now passing through the filter cloth h which latter is secured at its respective ends to the filtering member It, by a hand it, or the like as shown in dotted lines in the accompanying drawing, and said solution is then collected and passed into the central duct a", through the communicating vents j, the lattit,

sure merely resses the filter cloth 72, on to the surface of t e filtering member h, instead of away from it asin the ordinary so-called candle 'filter, with the result that there is no chance of the solution being imperfectly filtltl tered by passing through the folds or joints in the filtering medium which may happen when the fabric is forced awayfrom the surface. of the filtering member it, in ordinary practice.

The surface of this filtering member it, on

which the filtering textile fabric it, is wound,

may be corrugated or grooved or have a screw thread turned on it over the area of actual filtration so that the efilective filtering surface may be conveniently increased, provided that at the same time suitable drainage ducts are provided to deliver the solution to the collecting passages which deliver the solution to the inner duct and then to the jet from which the solution is expressed in say filament or rib-. bons as in ordinary practice.

l do not wish to be limited tothe era-ct details of construction as herein described. and- -shown as these may be varied Within the limits of the appended claim and without departing from the spirit of my invention.

l claim A filter; for use in the manufacture of artificial silk having in combination a removable casing, a swivel connection integral therewith, a filtering member within said casing being secured thereto at one end, a central duct in said filtering member terminating at the base, a spinning jet in direct communication with said central duct, a plurality of transverse vents in said filtering member, a circumferential groove formed at the respective ends of said filtering member, and a textile fabric surrounding said filtering member, being secured at each end around the circumferential grooves TllTlLllillAltf PUltTlElt DREAPER.

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